[mirror_ubuntu-artful-kernel.git] / fs / coda / psdev.c

/*
 *      	An implementation of a loadable kernel mode driver providing
 *		multiple kernel/user space bidirectional communications links.
 *
 * 		Author: 	Alan Cox <alan@redhat.com>
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 * 
 *              Adapted to become the Linux 2.0 Coda pseudo device
 *              Peter  Braam  <braam@maths.ox.ac.uk> 
 *              Michael Callahan <mjc@emmy.smith.edu>           
 *
 *              Changes for Linux 2.1
 *              Copyright (c) 1997 Carnegie-Mellon University
 */

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/time.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/fcntl.h>
#include <linux/delay.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/poll.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/smp_lock.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/system.h>
#include <asm/poll.h>
#include <asm/uaccess.h>

#include <linux/coda.h>
#include <linux/coda_linux.h>
#include <linux/coda_fs_i.h>
#include <linux/coda_psdev.h>
#include <linux/coda_proc.h>

#include "coda_int.h"

#define upc_free(r) kfree(r)

/* statistics */
int           coda_hard;         /* allows signals during upcalls */
unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */


struct venus_comm coda_comms[MAX_CODADEVS];
static struct class *coda_psdev_class;

/*
 * Device operations
 */

static unsigned int coda_psdev_poll(struct file *file, poll_table * wait)
{
        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
	unsigned int mask = POLLOUT | POLLWRNORM;

	poll_wait(file, &vcp->vc_waitq, wait);
	if (!list_empty(&vcp->vc_pending))
                mask |= POLLIN | POLLRDNORM;

	return mask;
}

static int coda_psdev_ioctl(struct inode * inode, struct file * filp, 
			    unsigned int cmd, unsigned long arg)
{
	unsigned int data;

	switch(cmd) {
	case CIOC_KERNEL_VERSION:
		data = CODA_KERNEL_VERSION;
		return put_user(data, (int __user *) arg);
	default:
		return -ENOTTY;
	}

	return 0;
}

/*
 *	Receive a message written by Venus to the psdev
 */
 
static ssize_t coda_psdev_write(struct file *file, const char __user *buf, 
				size_t nbytes, loff_t *off)
{
        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
        struct upc_req *req = NULL;
        struct upc_req *tmp;
	struct list_head *lh;
	struct coda_in_hdr hdr;
	ssize_t retval = 0, count = 0;
	int error;

        /* Peek at the opcode, uniquefier */
	if (copy_from_user(&hdr, buf, 2 * sizeof(u_long)))
	        return -EFAULT;

        if (DOWNCALL(hdr.opcode)) {
		struct super_block *sb = NULL;
                union outputArgs *dcbuf;
		int size = sizeof(*dcbuf);

		sb = vcp->vc_sb;
		if ( !sb ) {
                        count = nbytes;
                        goto out;
		}

		if  ( nbytes < sizeof(struct coda_out_hdr) ) {
		        printk("coda_downcall opc %d uniq %d, not enough!\n",
			       hdr.opcode, hdr.unique);
			count = nbytes;
			goto out;
		}
		if ( nbytes > size ) {
		        printk("Coda: downcall opc %d, uniq %d, too much!",
			       hdr.opcode, hdr.unique);
		        nbytes = size;
		}
		CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
		if (copy_from_user(dcbuf, buf, nbytes)) {
			CODA_FREE(dcbuf, nbytes);
			retval = -EFAULT;
			goto out;
		}

		/* what downcall errors does Venus handle ? */
		lock_kernel();
		error = coda_downcall(hdr.opcode, dcbuf, sb);
		unlock_kernel();

		CODA_FREE(dcbuf, nbytes);
		if (error) {
		        printk("psdev_write: coda_downcall error: %d\n", error);
			retval = error;
			goto out;
		}
		count = nbytes;
		goto out;
	}
        
	/* Look for the message on the processing queue. */
	lock_kernel();
	list_for_each(lh, &vcp->vc_processing) {
		tmp = list_entry(lh, struct upc_req , uc_chain);
		if (tmp->uc_unique == hdr.unique) {
			req = tmp;
			list_del(&req->uc_chain);
			break;
		}
	}
	unlock_kernel();

	if (!req) {
		printk("psdev_write: msg (%d, %d) not found\n", 
			hdr.opcode, hdr.unique);
		retval = -ESRCH;
		goto out;
	}

        /* move data into response buffer. */
	if (req->uc_outSize < nbytes) {
                printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
		       req->uc_outSize, (long)nbytes, hdr.opcode, hdr.unique);
		nbytes = req->uc_outSize; /* don't have more space! */
	}
        if (copy_from_user(req->uc_data, buf, nbytes)) {
		req->uc_flags |= REQ_ABORT;
		wake_up(&req->uc_sleep);
		retval = -EFAULT;
		goto out;
	}

	/* adjust outsize. is this useful ?? */
        req->uc_outSize = nbytes;	
        req->uc_flags |= REQ_WRITE;
	count = nbytes;

	/* Convert filedescriptor into a file handle */
	if (req->uc_opcode == CODA_OPEN_BY_FD) {
		struct coda_open_by_fd_out *outp =
			(struct coda_open_by_fd_out *)req->uc_data;
		if (!outp->oh.result)
			outp->fh = fget(outp->fd);
	}

        wake_up(&req->uc_sleep);
out:
        return(count ? count : retval);  
}

/*
 *	Read a message from the kernel to Venus
 */

static ssize_t coda_psdev_read(struct file * file, char __user * buf, 
			       size_t nbytes, loff_t *off)
{
	DECLARE_WAITQUEUE(wait, current);
        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
        struct upc_req *req;
	ssize_t retval = 0, count = 0;

	if (nbytes == 0)
		return 0;

	lock_kernel();

	add_wait_queue(&vcp->vc_waitq, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	while (list_empty(&vcp->vc_pending)) {
		if (file->f_flags & O_NONBLOCK) {
			retval = -EAGAIN;
			break;
		}
		if (signal_pending(current)) {
			retval = -ERESTARTSYS;
			break;
		}
		schedule();
	}

	set_current_state(TASK_RUNNING);
	remove_wait_queue(&vcp->vc_waitq, &wait);

	if (retval)
		goto out;

	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
	list_del(&req->uc_chain);

	/* Move the input args into userspace */
	count = req->uc_inSize;
	if (nbytes < req->uc_inSize) {
                printk ("psdev_read: Venus read %ld bytes of %d in message\n",
			(long)nbytes, req->uc_inSize);
		count = nbytes;
        }

	if (copy_to_user(buf, req->uc_data, count))
	        retval = -EFAULT;
        
	/* If request was not a signal, enqueue and don't free */
	if (!(req->uc_flags & REQ_ASYNC)) {
		req->uc_flags |= REQ_READ;
		list_add_tail(&(req->uc_chain), &vcp->vc_processing);
		goto out;
	}

	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
	upc_free(req);
out:
	unlock_kernel();
	return (count ? count : retval);
}

static int coda_psdev_open(struct inode * inode, struct file * file)
{
        struct venus_comm *vcp;
	int idx;

	lock_kernel();
	idx = iminor(inode);
	if(idx >= MAX_CODADEVS) {
		unlock_kernel();
		return -ENODEV;
	}

	vcp = &coda_comms[idx];
	if(vcp->vc_inuse) {
		unlock_kernel();
		return -EBUSY;
	}
	
	if (!vcp->vc_inuse++) {
		INIT_LIST_HEAD(&vcp->vc_pending);
		INIT_LIST_HEAD(&vcp->vc_processing);
		init_waitqueue_head(&vcp->vc_waitq);
		vcp->vc_sb = NULL;
		vcp->vc_seq = 0;
	}
	
	file->private_data = vcp;

	unlock_kernel();
        return 0;
}


static int coda_psdev_release(struct inode * inode, struct file * file)
{
        struct venus_comm *vcp = (struct venus_comm *) file->private_data;
        struct upc_req *req, *tmp;

	lock_kernel();
	if ( !vcp->vc_inuse ) {
		unlock_kernel();
		printk("psdev_release: Not open.\n");
		return -1;
	}

	if (--vcp->vc_inuse) {
		unlock_kernel();
		return 0;
	}
        
        /* Wakeup clients so they can return. */
	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
		/* Async requests need to be freed here */
		if (req->uc_flags & REQ_ASYNC) {
			CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
			upc_free(req);
			continue;
		}
		req->uc_flags |= REQ_ABORT;
		wake_up(&req->uc_sleep);
        }
        
	list_for_each_entry(req, &vcp->vc_processing, uc_chain) {
		req->uc_flags |= REQ_ABORT;
	        wake_up(&req->uc_sleep);
        }

	unlock_kernel();
	return 0;
}


static const struct file_operations coda_psdev_fops = {
	.owner		= THIS_MODULE,
	.read		= coda_psdev_read,
	.write		= coda_psdev_write,
	.poll		= coda_psdev_poll,
	.ioctl		= coda_psdev_ioctl,
	.open		= coda_psdev_open,
	.release	= coda_psdev_release,
};

static int init_coda_psdev(void)
{
	int i, err = 0;
	if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
              printk(KERN_ERR "coda_psdev: unable to get major %d\n", 
		     CODA_PSDEV_MAJOR);
              return -EIO;
	}
	coda_psdev_class = class_create(THIS_MODULE, "coda");
	if (IS_ERR(coda_psdev_class)) {
		err = PTR_ERR(coda_psdev_class);
		goto out_chrdev;
	}		
	for (i = 0; i < MAX_CODADEVS; i++)
		class_device_create(coda_psdev_class, NULL,
				MKDEV(CODA_PSDEV_MAJOR,i), NULL, "cfs%d", i);
	coda_sysctl_init();
	goto out;

out_chrdev:
	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
out:
	return err;
}


MODULE_AUTHOR("Peter J. Braam <braam@cs.cmu.edu>");
MODULE_LICENSE("GPL");

static int __init init_coda(void)
{
	int status;
	int i;
	printk(KERN_INFO "Coda Kernel/Venus communications, "
#ifdef CONFIG_CODA_FS_OLD_API
	       "v5.3.20"
#else
	       "v6.0.0"
#endif
	       ", coda@cs.cmu.edu\n");

	status = coda_init_inodecache();
	if (status)
		goto out2;
	status = init_coda_psdev();
	if ( status ) {
		printk("Problem (%d) in init_coda_psdev\n", status);
		goto out1;
	}
	
	status = register_filesystem(&coda_fs_type);
	if (status) {
		printk("coda: failed to register filesystem!\n");
		goto out;
	}
	return 0;
out:
	for (i = 0; i < MAX_CODADEVS; i++)
		class_device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
	class_destroy(coda_psdev_class);
	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	coda_sysctl_clean();
out1:
	coda_destroy_inodecache();
out2:
	return status;
}

static void __exit exit_coda(void)
{
        int err, i;

	err = unregister_filesystem(&coda_fs_type);
        if ( err != 0 ) {
                printk("coda: failed to unregister filesystem\n");
        }
	for (i = 0; i < MAX_CODADEVS; i++)
		class_device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
	class_destroy(coda_psdev_class);
	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	coda_sysctl_clean();
	coda_destroy_inodecache();
}

module_init(init_coda);
module_exit(exit_coda);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* An implementation of a loadable kernel mode driver providing
	3	* multiple kernel/user space bidirectional communications links.
	4	*
	5	* Author: Alan Cox <alan@redhat.com>
	6	*
	7	* This program is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU General Public License
	9	* as published by the Free Software Foundation; either version
	10	* 2 of the License, or (at your option) any later version.
	11	*
	12	* Adapted to become the Linux 2.0 Coda pseudo device
	13	* Peter Braam <braam@maths.ox.ac.uk>
	14	* Michael Callahan <mjc@emmy.smith.edu>
	15	*
	16	* Changes for Linux 2.1
	17	* Copyright (c) 1997 Carnegie-Mellon University
	18	*/
	19
	20	#include <linux/module.h>
	21	#include <linux/errno.h>
	22	#include <linux/kernel.h>
	23	#include <linux/major.h>
	24	#include <linux/time.h>
	25	#include <linux/slab.h>
	26	#include <linux/ioport.h>
	27	#include <linux/fcntl.h>
	28	#include <linux/delay.h>
	29	#include <linux/skbuff.h>
	30	#include <linux/proc_fs.h>
1da177e4 LT	31	#include <linux/vmalloc.h>
	32	#include <linux/fs.h>
	33	#include <linux/file.h>
	34	#include <linux/poll.h>
	35	#include <linux/init.h>
	36	#include <linux/list.h>
	37	#include <linux/smp_lock.h>
	38	#include <linux/device.h>
	39	#include <asm/io.h>
	40	#include <asm/system.h>
	41	#include <asm/poll.h>
	42	#include <asm/uaccess.h>
	43
	44	#include <linux/coda.h>
	45	#include <linux/coda_linux.h>
	46	#include <linux/coda_fs_i.h>
	47	#include <linux/coda_psdev.h>
	48	#include <linux/coda_proc.h>
	49
c98d8cfb	50	#include "coda_int.h"
1da177e4	51
c98d8cfb	52	#define upc_free(r) kfree(r)
1da177e4 LT	53
	54	/* statistics */
	55	int coda_hard; /* allows signals during upcalls */
	56	unsigned long coda_timeout = 30; /* .. secs, then signals will dequeue */
	57
	58
	59	struct venus_comm coda_comms[MAX_CODADEVS];
1db560af	60	static struct class *coda_psdev_class;
1da177e4 LT	61
	62	/*
	63	* Device operations
	64	*/
	65
	66	static unsigned int coda_psdev_poll(struct file file, poll_table wait)
	67	{
	68	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	69	unsigned int mask = POLLOUT \| POLLWRNORM;
	70
	71	poll_wait(file, &vcp->vc_waitq, wait);
	72	if (!list_empty(&vcp->vc_pending))
	73	mask \|= POLLIN \| POLLRDNORM;
	74
	75	return mask;
	76	}
	77
	78	static int coda_psdev_ioctl(struct inode * inode, struct file * filp,
	79	unsigned int cmd, unsigned long arg)
	80	{
	81	unsigned int data;
	82
	83	switch(cmd) {
	84	case CIOC_KERNEL_VERSION:
	85	data = CODA_KERNEL_VERSION;
	86	return put_user(data, (int __user *) arg);
	87	default:
	88	return -ENOTTY;
	89	}
	90
	91	return 0;
	92	}
	93
	94	/*
	95	* Receive a message written by Venus to the psdev
	96	*/
	97
	98	static ssize_t coda_psdev_write(struct file file, const char __user buf,
	99	size_t nbytes, loff_t *off)
	100	{
	101	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	102	struct upc_req *req = NULL;
	103	struct upc_req *tmp;
	104	struct list_head *lh;
	105	struct coda_in_hdr hdr;
	106	ssize_t retval = 0, count = 0;
	107	int error;
	108
	109	/* Peek at the opcode, uniquefier */
	110	if (copy_from_user(&hdr, buf, 2 * sizeof(u_long)))
	111	return -EFAULT;
	112
	113	if (DOWNCALL(hdr.opcode)) {
	114	struct super_block *sb = NULL;
	115	union outputArgs *dcbuf;
	116	int size = sizeof(*dcbuf);
	117
	118	sb = vcp->vc_sb;
	119	if ( !sb ) {
	120	count = nbytes;
	121	goto out;
	122	}
	123
	124	if ( nbytes < sizeof(struct coda_out_hdr) ) {
125	printk("coda_downcall opc %d uniq %d, not enough!\n",
126	hdr.opcode, hdr.unique);
127	count = nbytes;
128	goto out;
129	}
130	if ( nbytes > size ) {
131	printk("Coda: downcall opc %d, uniq %d, too much!",
132	hdr.opcode, hdr.unique);
133	nbytes = size;
134	}
135	CODA_ALLOC(dcbuf, union outputArgs *, nbytes);
136	if (copy_from_user(dcbuf, buf, nbytes)) {
137	CODA_FREE(dcbuf, nbytes);
138	retval = -EFAULT;
139	goto out;
140	}
141
142	/* what downcall errors does Venus handle ? */
143	lock_kernel();
144	error = coda_downcall(hdr.opcode, dcbuf, sb);
145	unlock_kernel();
146
147	CODA_FREE(dcbuf, nbytes);
148	if (error) {
149	printk("psdev_write: coda_downcall error: %d\n", error);
150	retval = error;
151	goto out;
152	}
153	count = nbytes;
154	goto out;
155	}
156
157	/* Look for the message on the processing queue. */
158	lock_kernel();
159	list_for_each(lh, &vcp->vc_processing) {
160	tmp = list_entry(lh, struct upc_req , uc_chain);
161	if (tmp->uc_unique == hdr.unique) {
162	req = tmp;
163	list_del(&req->uc_chain);
164	break;
165	}
166	}
167	unlock_kernel();
168
169	if (!req) {
170	printk("psdev_write: msg (%d, %d) not found\n",
171	hdr.opcode, hdr.unique);
172	retval = -ESRCH;
173	goto out;
174	}
175
176	/* move data into response buffer. */
177	if (req->uc_outSize < nbytes) {
178	printk("psdev_write: too much cnt: %d, cnt: %ld, opc: %d, uniq: %d.\n",
179	req->uc_outSize, (long)nbytes, hdr.opcode, hdr.unique);
180	nbytes = req->uc_outSize; /* don't have more space! */
181	}
182	if (copy_from_user(req->uc_data, buf, nbytes)) {
183	req->uc_flags \|= REQ_ABORT;
184	wake_up(&req->uc_sleep);
185	retval = -EFAULT;
186	goto out;
187	}
188
189	/* adjust outsize. is this useful ?? */
190	req->uc_outSize = nbytes;
191	req->uc_flags \|= REQ_WRITE;
192	count = nbytes;
193
194	/* Convert filedescriptor into a file handle */
195	if (req->uc_opcode == CODA_OPEN_BY_FD) {
196	struct coda_open_by_fd_out *outp =
197	(struct coda_open_by_fd_out *)req->uc_data;
38c2e437 JH	198	if (!outp->oh.result)
38c2e437 JH	199	outp->fh = fget(outp->fd);
1da177e4 LT	200	}
	201
	202	wake_up(&req->uc_sleep);
	203	out:
	204	return(count ? count : retval);
	205	}
	206
	207	/*
	208	* Read a message from the kernel to Venus
	209	*/
	210
	211	static ssize_t coda_psdev_read(struct file * file, char __user * buf,
	212	size_t nbytes, loff_t *off)
	213	{
	214	DECLARE_WAITQUEUE(wait, current);
	215	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	216	struct upc_req *req;
	217	ssize_t retval = 0, count = 0;
	218
	219	if (nbytes == 0)
	220	return 0;
	221
	222	lock_kernel();
	223
	224	add_wait_queue(&vcp->vc_waitq, &wait);
	225	set_current_state(TASK_INTERRUPTIBLE);
	226
	227	while (list_empty(&vcp->vc_pending)) {
	228	if (file->f_flags & O_NONBLOCK) {
	229	retval = -EAGAIN;
	230	break;
	231	}
	232	if (signal_pending(current)) {
	233	retval = -ERESTARTSYS;
	234	break;
	235	}
	236	schedule();
	237	}
	238
	239	set_current_state(TASK_RUNNING);
	240	remove_wait_queue(&vcp->vc_waitq, &wait);
	241
	242	if (retval)
	243	goto out;
	244
	245	req = list_entry(vcp->vc_pending.next, struct upc_req,uc_chain);
	246	list_del(&req->uc_chain);
	247
	248	/* Move the input args into userspace */
	249	count = req->uc_inSize;
	250	if (nbytes < req->uc_inSize) {
	251	printk ("psdev_read: Venus read %ld bytes of %d in message\n",
	252	(long)nbytes, req->uc_inSize);
	253	count = nbytes;
	254	}
	255
	256	if (copy_to_user(buf, req->uc_data, count))
	257	retval = -EFAULT;
	258
	259	/* If request was not a signal, enqueue and don't free */
	260	if (!(req->uc_flags & REQ_ASYNC)) {
	261	req->uc_flags \|= REQ_READ;
8e13059a	262	list_add_tail(&(req->uc_chain), &vcp->vc_processing);
1da177e4 LT	263	goto out;
	264	}
	265
	266	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
	267	upc_free(req);
	268	out:
	269	unlock_kernel();
	270	return (count ? count : retval);
	271	}
	272
	273	static int coda_psdev_open(struct inode * inode, struct file * file)
	274	{
	275	struct venus_comm *vcp;
	276	int idx;
	277
	278	lock_kernel();
	279	idx = iminor(inode);
	280	if(idx >= MAX_CODADEVS) {
	281	unlock_kernel();
	282	return -ENODEV;
	283	}
	284
	285	vcp = &coda_comms[idx];
	286	if(vcp->vc_inuse) {
	287	unlock_kernel();
	288	return -EBUSY;
	289	}
	290
	291	if (!vcp->vc_inuse++) {
	292	INIT_LIST_HEAD(&vcp->vc_pending);
	293	INIT_LIST_HEAD(&vcp->vc_processing);
	294	init_waitqueue_head(&vcp->vc_waitq);
	295	vcp->vc_sb = NULL;
	296	vcp->vc_seq = 0;
	297	}
	298
	299	file->private_data = vcp;
	300
	301	unlock_kernel();
	302	return 0;
	303	}
	304
	305
	306	static int coda_psdev_release(struct inode * inode, struct file * file)
	307	{
	308	struct venus_comm vcp = (struct venus_comm ) file->private_data;
	309	struct upc_req req, tmp;
	310
	311	lock_kernel();
	312	if ( !vcp->vc_inuse ) {
	313	unlock_kernel();
	314	printk("psdev_release: Not open.\n");
	315	return -1;
	316	}
	317
	318	if (--vcp->vc_inuse) {
	319	unlock_kernel();
	320	return 0;
	321	}
	322
	323	/* Wakeup clients so they can return. */
	324	list_for_each_entry_safe(req, tmp, &vcp->vc_pending, uc_chain) {
	325	/* Async requests need to be freed here */
	326	if (req->uc_flags & REQ_ASYNC) {
327	CODA_FREE(req->uc_data, sizeof(struct coda_in_hdr));
328	upc_free(req);
329	continue;
330	}
331	req->uc_flags \|= REQ_ABORT;
332	wake_up(&req->uc_sleep);
333	}
334
335	list_for_each_entry(req, &vcp->vc_processing, uc_chain) {
336	req->uc_flags \|= REQ_ABORT;
337	wake_up(&req->uc_sleep);
338	}
339
340	unlock_kernel();
341	return 0;
342	}
343
344
4b6f5d20	345	static const struct file_operations coda_psdev_fops = {
1da177e4 LT	346	.owner = THIS_MODULE,
	347	.read = coda_psdev_read,
	348	.write = coda_psdev_write,
	349	.poll = coda_psdev_poll,
	350	.ioctl = coda_psdev_ioctl,
	351	.open = coda_psdev_open,
	352	.release = coda_psdev_release,
	353	};
	354
	355	static int init_coda_psdev(void)
	356	{
	357	int i, err = 0;
	358	if (register_chrdev(CODA_PSDEV_MAJOR, "coda", &coda_psdev_fops)) {
	359	printk(KERN_ERR "coda_psdev: unable to get major %d\n",
	360	CODA_PSDEV_MAJOR);
	361	return -EIO;
	362	}
1db560af	363	coda_psdev_class = class_create(THIS_MODULE, "coda");
1da177e4 LT	364	if (IS_ERR(coda_psdev_class)) {
	365	err = PTR_ERR(coda_psdev_class);
	366	goto out_chrdev;
	367	}
7c69ef79	368	for (i = 0; i < MAX_CODADEVS; i++)
53f46542 GKH	369	class_device_create(coda_psdev_class, NULL,
53f46542 GKH	370	MKDEV(CODA_PSDEV_MAJOR,i), NULL, "cfs%d", i);
1da177e4 LT	371	coda_sysctl_init();
	372	goto out;
	373
1da177e4 LT	374	out_chrdev:
	375	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	376	out:
	377	return err;
	378	}
	379
	380
	381	MODULE_AUTHOR("Peter J. Braam <braam@cs.cmu.edu>");
	382	MODULE_LICENSE("GPL");
	383
1da177e4 LT	384	static int __init init_coda(void)
	385	{
	386	int status;
	387	int i;
	388	printk(KERN_INFO "Coda Kernel/Venus communications, "
	389	#ifdef CONFIG_CODA_FS_OLD_API
	390	"v5.3.20"
	391	#else
	392	"v6.0.0"
	393	#endif
	394	", coda@cs.cmu.edu\n");
	395
	396	status = coda_init_inodecache();
	397	if (status)
	398	goto out2;
	399	status = init_coda_psdev();
	400	if ( status ) {
	401	printk("Problem (%d) in init_coda_psdev\n", status);
	402	goto out1;
	403	}
	404
	405	status = register_filesystem(&coda_fs_type);
	406	if (status) {
	407	printk("coda: failed to register filesystem!\n");
	408	goto out;
	409	}
	410	return 0;
	411	out:
8ab5e4c1	412	for (i = 0; i < MAX_CODADEVS; i++)
1db560af	413	class_device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	414	class_destroy(coda_psdev_class);
1da177e4 LT	415	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	416	coda_sysctl_clean();
	417	out1:
	418	coda_destroy_inodecache();
	419	out2:
	420	return status;
	421	}
	422
	423	static void __exit exit_coda(void)
	424	{
	425	int err, i;
	426
	427	err = unregister_filesystem(&coda_fs_type);
	428	if ( err != 0 ) {
	429	printk("coda: failed to unregister filesystem\n");
	430	}
8ab5e4c1	431	for (i = 0; i < MAX_CODADEVS; i++)
1db560af	432	class_device_destroy(coda_psdev_class, MKDEV(CODA_PSDEV_MAJOR, i));
1db560af	433	class_destroy(coda_psdev_class);
1da177e4 LT	434	unregister_chrdev(CODA_PSDEV_MAJOR, "coda");
	435	coda_sysctl_clean();
	436	coda_destroy_inodecache();
	437	}
	438
	439	module_init(init_coda);
	440	module_exit(exit_coda);
	441